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Liquid crystal display device manufacturing method

A technology of a liquid crystal display device and a manufacturing method, which is applied in the direction of instruments, coatings, optics, etc., can solve the problems of thin film transistor element damage, uneven display, foreign matter defects, etc., and achieve good VHR, good contrast, and good viewing angle characteristics Effect

Inactive Publication Date: 2017-08-01
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the rubbing method is used, there are problems such as foreign matter defects and display unevenness caused by dust generated by the cloth, and destruction of thin film transistor elements caused by static electricity when wiping with a cloth.
In addition, with the development of high-definition tablet PCs and smartphones, it has become increasingly difficult to align liquid crystal molecules uniformly in the rubbing method in which the accuracy of the alignment process is limited by the density of the wool of the cloth.

Method used

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  • Liquid crystal display device manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The method for manufacturing a liquid crystal display device according to Embodiment 1 will be described sequentially below.

[0065] (Substrate for forming photo-alignment film)

[0066] A thin-film transistor (TFT) substrate including an electrode structure for FFS mode, an In-Ga-Zn-O-based oxide semiconductor, and the like, and a color filter (CF) substrate provided with photo-spacers with a height of 3.2 μm were prepared.

[0067] (photoalignment film material)

[0068]As for the photo-alignment film material, a material containing a photoreactive polymer, a non-photoreactive polymer, and a solvent is prepared.

[0069] As the photoreactive polymer, a polymer having polysiloxane on the main chain and a cinnamate group as a photofunctional group on the side chain is used. As the non-photoreactive polymer, a polyamic acid obtained by reacting 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA) and a biphenyl structure-containing diamine is used. As the solvent, a...

Embodiment 2

[0081] The method of manufacturing the liquid crystal display device of Example 2 is the same as the method of manufacturing the liquid crystal display device of Example 1 except that the structure of the photoreactive polymer is different. In Example 2, as the photoreactive polymer, a polymer having polyamic acid on the main chain and a cinnamate group as a photofunctional group on the side chain was used. The mixing ratio of photoreactive polymer to non-photoreactive polymer is 3:7. That is, the proportion of the photoreactive polymer was 30% by weight and the proportion of the non-photoreactive polymer was 70% by weight based on the entire solid content contained in the photoalignment film material.

Embodiment 3-1

[0110] The method of manufacturing the liquid crystal display device of Example 3-1 was the same as the method of manufacturing the liquid crystal display device of Example 1 except that the first stage of the main firing process was performed at 90° C. for 15 minutes.

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Abstract

A manufacturing method of a liquid crystal display device is provided which can decrease the intensity of light irradiated in alignment treatment of a photo-alignment film and which can obtain excellent contrast and viewing angle characteristics. This manufacturing method of a liquid crystal display device provided with a photo-alignment film involves, in order, a step (1) for formation on a substrate of a film made from a photo-alignment film material that contains two or more polymers and a solvent, a step (2) for pre-calcination for evaporating the solvent from the film, a step (3) for main calcination of the pre-calcined film in a stepwise manner, at multiple temperatures from a low temperature to a high temperature, and a step (4) for subjecting the film which has undergone the main calcination to polarized light irradiation, wherein at least one of the aforementioned two or more polymers is a light-reactive polymer having an optical functional group in a side chain.

Description

[0001] technology area [0002] The present invention relates to a method for manufacturing a liquid crystal display device. In more detail, it is related with the manufacturing method of the liquid crystal display device concerning the formation condition of an alignment film. Background technique [0003] In recent years, thin display devices such as liquid crystal display devices have spread rapidly, and they are not only used in televisions, but also in electronic books, photo frames, IA (Industrial Appliance: industrial equipment), PC (Personal Computer: personal computer), tablet PC, and smart phones. etc. are widely adopted. [0004] In a liquid crystal display device, the liquid crystal molecules are pursued to align uniformly. As an alignment treatment method for aligning the liquid crystal molecules, for example, the rubbing method and the photoalignment method can be enumerated. In the past, the method of wiping the surface of the alignment film with a cloth was wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08L101/00C08L101/02
CPCG02F1/133711G02F1/133788C09D179/08C09D201/02C09D183/06C08G77/20C08G73/1078G02F1/133723G02F2202/025C08L83/06C08L101/02C08L101/00G02F1/1337C08L101/025C08L101/04C08L101/10
Inventor 浅木大明三宅敢川平雄一
Owner SHARP KK